US9670892B2 - Engine startup device - Google Patents

Engine startup device Download PDF

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Publication number
US9670892B2
US9670892B2 US14/378,713 US201214378713A US9670892B2 US 9670892 B2 US9670892 B2 US 9670892B2 US 201214378713 A US201214378713 A US 201214378713A US 9670892 B2 US9670892 B2 US 9670892B2
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moving body
motor
output shaft
notch
helical spline
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US20150020761A1 (en
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Masami Abe
Koichiro Kamei
Kazuhiro Odahara
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ABE, MASAMI, KAMEI, KOICHIRO, ODAHARA, KAZUHIRO
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/087—Details of the switching means in starting circuits, e.g. relays or electronic switches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
    • F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
    • F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
    • F02N15/06—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement
    • F02N15/062—Starter drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
    • F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
    • F02N15/022—Gearing between starting-engines and started engines; Engagement or disengagement thereof the starter comprising an intermediate clutch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
    • F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
    • F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
    • F02N15/043—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the gearing including a speed reducer
    • F02N15/046—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the gearing including a speed reducer of the planetary type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
    • F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
    • F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
    • F02N15/06—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement
    • F02N15/067—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement the starter comprising an electro-magnetically actuated lever
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/087—Details of the switching means in starting circuits, e.g. relays or electronic switches
    • F02N2011/0874—Details of the switching means in starting circuits, e.g. relays or electronic switches characterised by said switch being an electronic switch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N15/00—Other power-operated starting apparatus; Component parts, details, or accessories, not provided for in, or of interest apart from groups F02N5/00 - F02N13/00
    • F02N15/02—Gearing between starting-engines and started engines; Engagement or disengagement thereof
    • F02N15/04—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears
    • F02N15/06—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement
    • F02N2015/061—Gearing between starting-engines and started engines; Engagement or disengagement thereof the gearing including disengaging toothed gears the toothed gears being moved by axial displacement said axial displacement being limited, e.g. by using a stopper
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/02—Non-polarised relays
    • H01H51/04—Non-polarised relays with single armature; with single set of ganged armatures
    • H01H51/06—Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored during the movement in the first direction, e.g. by using a spring, by using a permanent magnet, by gravity
    • H01H51/065—Relays having a pair of normally open contacts rigidly fixed to a magnetic core movable along the axis of a solenoid, e.g. relays for starting automobiles

Definitions

  • the present invention relates to an engine startup device that transmits motor torque from a moving body to a ring gear of an engine so as to start up the engine.
  • Patent document 1 Japanese Laid-open Patent Publication No. 2009-191843
  • Patent document 2 Japanese Laid-open Patent Publication No. 2010-236533
  • the motor activation circuit in order to enable engagement during high speed rotation, is sometimes operated before operation of thrusting out the moving body. If motor torque is transmitted from the output shaft to the moving body via the helical spline engagement at this moment, force due to the motor rotation is generated in a shaft direction attributed to the lead angle, which is the inclination of the gear helical spline, and the inertia of the moving body, which would therefore pose a danger of the moving body jumping out to touch the ring gear.
  • FIG. 3 is a diagram for explaining a problem with a conventional engine startup device equipped with such an electromagnetic switch as described above, which can independently perform the functions of turning on/off the motor activation circuit and making the moving body jump out;
  • FIG. 3( a ) shows when the motor stopping and
  • FIG. 3( b ) when the motor rotating.
  • the output shaft rotates by rotation energy from the motor.
  • the rotation energy from the output shaft is transmitted to the moving body with helical splines 37 and 38 of the output shaft and the moving body engaging with each other; when the output shaft rotates in the direction indicated by the arrow X, the moving body jumps out in the axial direction (direction indicated by the arrow Y), by the inclination of the helical spline engagement and the inertia of the moving body.
  • the diagram in FIG. 3 is turned clockwise by 90°, it comes in the same direction as FIG. 1 and FIG. 2 described later; the ring gear is located in FIG. 3( b ) in the upward direction (direction indicated by the arrow Y).
  • the helical-spline-engaging part which is originally circular, is illustrated by a plan view, showing how gears engage with each other.
  • a plunger spring that urges a moving-body-operating plunger is increased in load, whereby the moving body is pressed via a thrust-out mechanism in the opposite direction of the ring gear, so that the moving body can be prevented from jumping out; however, attraction force of the moving-body-operating plunger needs to be increased in this case, causing a problem in that the electromagnetic switch will increase in size.
  • the present invention has been made to solve such a problem as described above, and aims at providing an engine startup device that can prevent the moving body from jumping out by the motor torque and the lead angle at the helical-spline-engaging part of the output shaft and moving body, without increasing the size of the electromagnetic switch, even if the motor activation circuit is turned on before the moving body thrust-out function is performed.
  • An engine startup device comprises: a motor that produces torque with electric power supplied thereto; an output shaft on which is formed a helical spline that transmits the torque from the motor; a moving body that has a helical spline engaging with the output shaft and transmits the torque from the motor to an engine; and an electromagnetic switch equipped with a mechanism that independently performs a function of magnetizing a motor-operating plunger by activating a motor-operating solenoid coil and switching on/off the power to the motor by the movement of the motor-operating plunger, and a function of magnetizing a moving-body-operating plunger by activating a moving-body-operating solenoid coil and thrusting out the moving body toward a ring gear side via a thrust-out mechanism by the movement of the moving-body-operating plunger; wherein a notch is formed on a power-transmitting-side tooth surface of a helical spline of at least either one of the output shaft and the moving body, and
  • the angle formed by the notch with respect to the motor axis direction is made smaller than the lead angle of the helical spline.
  • the moving body will not jump out even if the motor activation circuit is operated before the function of thrusting out the moving body is performed; therefore, the durability of the moving body and the ring gear can be enhanced, and at the same time, noise due to their collision can be eliminated, so that effects on silence can be expected. Furthermore, structural modification to the existing gear profile is small and the appearance of the engine startup device remains unchanged, so that an engine startup device excelling in layout flexibility can be provided.
  • FIG. 1 is a schematic configuration diagram of an engine startup device according to Embodiment 1 to Embodiment 3 of the present invention
  • FIG. 2 is a schematic diagram of a helical-spline-engaging mechanism according to Embodiment 1 to Embodiment 3 of the present invention
  • FIG. 3 is a detailed diagram for explaining a problem of a moving body jumping out at startup of motor rotation in a conventional device, which forms the background of this invention
  • FIG. 4 is a diagram of arrangement of helical splines of an output shaft and the moving body in Embodiment 1 and Embodiment 2 of the present invention
  • FIG. 5 is a cross-sectional diagram showing notches of the output shaft and power-transmitting-side tooth surfaces of the moving body engaging with each other in Embodiment 1 of the present invention
  • FIG. 6 is a detailed diagram showing the lead angles of the notches of the output shaft and the power-transmitting-side tooth surfaces thereof in Embodiment 1 of the present invention.
  • FIG. 7 is a detailed gear diagram showing the notches of the output shaft and the power-transmitting-side tooth surfaces thereof in Embodiment 1 of the present invention.
  • FIG. 8 is a detailed diagram showing the lead angles of notches of a moving body and power-transmitting-side tooth surfaces thereof in Embodiment 2 of the present invention.
  • FIG. 9 is a detailed gear diagram showing the notches of the output shaft and the power-transmitting-side tooth surfaces thereof in Embodiment 2 of the present invention.
  • FIG. 10 is a detailed diagram showing notches of a moving body, power-transmitting-side tooth surfaces thereof and the lead angle of a tooth surface parallel to the power-transmitting-side tooth surfaces in Embodiment 3 of the present invention;
  • FIG. 11 is a diagram showing arrangement of helical splines of an output shaft and the moving body in Embodiment 3 of the present invention.
  • FIG. 12 is graphs for explaining estimation of jump-out distance of the moving bodies in the present invention.
  • FIG. 1 to FIG. 12 the same reference numerals represent the same or corresponding parts in each drawing.
  • FIG. 1 is a schematic configuration diagram of an engine startup device according to Embodiment 1 of the present invention.
  • the engine startup device 1 includes a motor 2 that produces torque with electric power supplied to it; a moving body 3 that is helical-spline-engaged with an output shaft 5 for transmitting the torque from the motor 2 and engages with a ring gear 36 , thereby transmitting the torque from the motor 2 to the engine; and a stopper 7 that restricts jump out of the moving body 3 toward the ring gear 36 .
  • the motor 2 includes an armature 9 , which serves as a rotor; a yoke 11 having a permanent magnet 10 along the inner circumference thereof; and a brush 12 .
  • the armature 9 includes a core 9 a , an armature coil 9 b , a motor shaft 9 c and a commutator 9 d ; with a current flowing through the armature coil 9 b , magnetic flux generated by the current and the core 9 a interacts with the permanent magnet 10 to produce the torque.
  • the motor is a well-known DC motor in which rotation is maintained in one direction by the commutator 9 d and the brush 12 .
  • An electromagnetic switch 35 includes a thrust-out mechanism for the moving body and a motor activation circuit.
  • the thrust-out mechanism for the moving body magnetizes a moving-body-operating plunger 32 by activating a moving-body-operating solenoid coil 29 housed in a moving-body-operating bobbin 30 .
  • the thrust-out mechanism is configured such that the magnetized moving-body-operating plunger 32 is attracted toward a moving-body-operating core switch 28 , with a plunger spring 39 being warped, whereby a hook 34 attached to the moving-body-operating plunger 32 thrusts out the moving body 3 toward the ring gear 36 side via the thrust-out mechanism 33 .
  • the motor activation circuit activates a motor-operating solenoid coil 26 housed in a motor-operating bobbin 25 , and thereby magnetizes a motor-operating plunger 27 .
  • the magnetized motor-operating plunger 27 is attracted toward a motor-operating core switch 24 , thereby pressing a rod 21 attached with a moving contact 22 ; a fixed B-contact 18 to which voltage is always applied from a battery, a fixed M-contact 17 connected to the motor and the moving contact 22 are contacted with each other, and a current from the battery thereby flows through the motor 2 , so that the motor 2 will rotate.
  • a point spring 23 that urges the moving contact 22 toward the fixed B-contact 18 and the fixed M-contact 17 (hereinafter each simply referred to as a fixed contact) is inserted between the rod 21 and moving contact 22 , thereby securing pressing force so that the moving contact 22 is not separated from the fixed contacts 17 and 18 .
  • a current flowing through the motor-operating solenoid coil 26 is interrupted, the rod 21 is pushed back by a return spring 20 , and the moving contact 22 is separated from the fixed contacts 17 and 18 , whereby the motor 2 stops rotating.
  • This thrust-out mechanism for the moving body and the motor activation circuit are housed in a casing 31 , and a cap switch 19 attached with the fixed contacts is caulked with the casing 31 so that the contact portion is protected from fine particles and the like outside.
  • the foregoing motor 2 and electromagnetic switch 35 are fit into a receiving/fixing portion in the engine side and the front bracket 6 that serves as a ground circuit for the engine startup device.
  • the bearing 8 press-inserted in the front bracket 6 rotatably supports the output shaft.
  • a helical-spline-engaging mechanism of the engine startup device according to Embodiment 1 will be explained next referring to FIG. 2 to FIG. 7 .
  • a notch 37 b is formed at the rear end of a power-transmitting-side tooth surface 37 a on the side where the torque from the helical spline 37 of the output shaft 5 is transmitted.
  • the power-transmitting-side tooth surface 37 a is a surface on which the helical spline of the output shaft engages with a helical spline 38 of the moving body 3 when the moving body 3 is engaged with the ring gear 36 by the thrust-out mechanism 33 so as to transmit the torque from the motor 2 to the engine; however, the notch 37 b newly provided in Embodiment 1 is a surface on which the helical spline 38 of the moving body 3 touches part of the helical spline 37 of the output shaft 5 when the motor-operating solenoid coil 26 of the electromagnetic switch 35 is activated earlier than the moving-body-operating solenoid coil 29 and the motor 2 thereby starts rotating before the moving body 3 jumps out. (See FIG. 5 .)
  • the lead angle ⁇ b of the notch 37 b of the output shaft 5 is set, with respect to the shaft direction, smaller than the lead angle ⁇ a of the power-transmitting-side tooth surface 37 a ( ⁇ a> ⁇ b); the notch 37 b of the output shaft 5 is designed such that the moving body 3 does not collide with the ring gear 36 , even if the moving body 3 jumps out by the torque from the motor 2 and the inertia of the moving body 3 , when the motor-operating solenoid coil 26 of the electromagnetic switch 35 is activated earlier than the moving-body-operating solenoid coil 29 .
  • Jump-out distance of the moving body 3 at startup of the motor rotation can be estimated as follows:
  • the mass of the moving body 3 be m, the inertia, I, the angular frequency of the motor 2 , ⁇ , its angular acceleration, ⁇ , the radius of the helical spline pitch circle, r, and time, t.
  • FIG. 12( a ) shows the relation between motor rotation speed and time elapsed in the engine startup device 1 .
  • thrust-out force of the moving body 3 in the axial direction is F 1
  • friction force to the thrust-out force F 1 , F ⁇ and the lead angle of the notch 37 b , ⁇ b the thrust-out force F 1 is given by the following equation (2).
  • F 1 I ⁇ /r ⁇ tan(90 ° ⁇ b ) ⁇ F ⁇ (2)
  • the jump-out distance can be obtained as the total distance from time t 0 when the motor starts rotating to time tn; therefore, the jump-out distance of the moving body 3 can be obtained by the following equation (4), which becomes as the graph shown in FIG. 12( b ) .
  • the lead angle ⁇ b of the notch 37 b of the output shaft 5 is decided in a manner as described above, whereby the moving body can be prevented from jumping out at startup of the motor rotation.
  • the engine startup device according to Embodiment 1 of the present invention is designed in such a way that part of the helical spline 38 of the moving body 3 overlaps as shown in FIG. 4 the helical spline 37 of the output shaft 5 when the engine startup device 1 stopping.
  • the helical spline 37 of the output shaft 5 overlaps the helical spline 38 of the moving body 3 over the notch 37 b of the output shaft 5 .
  • the reason why is that the longer the axial length of the notch 37 b of the output shaft 5 is, the thinner the tooth becomes towards the end of the helical spline 37 of the output shaft 5 , thereby reducing its strength. Therefore, the length along which the notch 37 b of the output shaft 5 overlaps the helical spline 38 of the moving body 3 is decreased, whereby the axial length of the notch 37 b of the output shaft can be decreased.
  • the overlapping axial length is made exactly the length along which the notch and the helical spline certainly overlap each other, taking into consideration tolerance of relating dimensions and variations in assembly.
  • torque applied to the notch 37 b of the output shaft 5 is very low, attributed to the inertia of the moving body 3 and rotation of the motor 2 .
  • the transmission is performed through the power-transmitting-side tooth surface 37 a of the output shaft 5 , which is not changed from the original profile; therefore, reduction in strength of the notch 37 b of the output shaft 5 does not cause any serious problem.
  • the torque-transmitting-side tooth surface of the helical spline 38 of the moving body 3 is formed in an involute curve as shown in FIG. 7
  • the power-transmitting-side tooth surface of the notch 37 b of the output shaft 5 is also formed in the involute curve
  • the helical spline of the output shaft can face-contact the helical spline 38 of the moving body 3 , so that pressure per unit area when torque is applied thereto can be reduced.
  • the notch 37 b of the output shaft 5 is a surface parallel with reference to the transverse gear tooth tip center of the helical spline, the notch 37 b crosses the involute curve of the power-transmitting-side tooth surface 37 a of the output shaft 5 ; therefore, the axial length of the notch 37 b of the output shaft 5 becomes shorter toward the tip of the tooth from the root thereof.
  • the axial length of the notch 37 b of the output shaft 5 and the location of the helical spline 38 of the moving body 3 overlapping the notch must be set in accordance with the length of the shortened tooth tip side; however, by forming the notch 37 b of the output shaft 5 in the involute curve, the axial length of the notch 37 b of the output shaft 5 can be made the same at both the root of the tooth and the tip thereof, so that the axial length of the notch 37 b of the output shaft 5 can be set short.
  • the same effect can be produced by setting the notch at an angle equivalent to the transverse pressure angle, with reference to the transverse gear tooth tip center of the helical spline 37 of the output shaft 5 .
  • the notch 37 b is provided on the output shaft 5 in Embodiment 1; however in Embodiment 2, a notch 38 b is provided as shown in FIG. 4( b ) on the helical spline 38 of the moving body 3 instead, and as shown in FIG. 8 , the lead angle ⁇ b of the notch 38 b of the moving body is set, with respect to the motor shaft direction, smaller than the lead angle ⁇ a of the power-transmitting-side tooth surface 38 a of the moving body ( ⁇ a> ⁇ b).
  • part (rear end) of the helical spline 37 of the output shaft 5 is designed to overlap the notch 38 b of the moving body 3 when the engine startup device 1 stopping, whereby the same effect as that in Embodiment 1 can be produced.
  • the torque-transmitting-side tooth surface of the helical spline 37 of the output shaft 5 is formed in the involute curve as shown in FIG. 9
  • the torque-transmitting-side tooth surface of the notch 38 b of the moving body 3 is also formed in the involute curve, whereby the tooth surface can face-contact the helical spline 37 of the output shaft 5 , pressure per unit area when torque is applied can be decreased, and the axial length of the surface of the notch 38 b of the moving body 3 can be made the same at both the root of the tooth and the tip thereof, so that the axial length of the notch 38 b of the moving body 3 can be set short.
  • the same effect can be produced by setting the notch at an angle equivalent to the transverse pressure angle with reference to the transverse gear tooth bottom center of the helical spline 38 of the output shaft 3 .
  • the notch may be provided on both of the helical spline 37 of the output shaft 5 and the helical spline 38 of the moving body 3 .
  • Embodiment 1 it is explained in Embodiment 1 that the longer the axial length of the notch is, the thinner the tooth of the helical spline becomes, and as a result the strength thereof will be lowered.
  • the tip of the tooth becomes sharp in specifications requiring a large notch, so the tooth tip is likely to chip off.
  • the notch 38 b of the moving body 3 is not formed up to the tip of the helical spline 38 , but limited within an axial length that is necessary for the notch engaging with the power-transmitting-side tooth surface at the rear end of the helical spline 37 of the output shaft, and the tip portion is formed in such a profile that a tooth surface 38 c parallel to the power-transmitting-side tooth surface 38 a is extended up to the notch 38 b as shown in FIG. 10 and FIG. 11 .
  • Embodiment 3 provides a solution to that, in which as shown in FIG. 11( b ) , the notch 38 b of the moving body is formed up to a point from which the notch axially overlaps the rear end of the helical spline 37 of the output shaft, even if any tolerance is taken into consideration. Then, the lead angle of the tooth surface 38 c is set so that the tooth surface 38 c becomes parallel to the power-transmitting-side tooth surface 38 a in the engine side beyond this point. By doing in this way, the tip of the notch 38 b can be prevented from sharpening.
  • the output shaft may be provided with a notch with the same profile as the power-transmitting-side tooth surface of the moving body.
  • the present invention is preferable for an engine startup device that transmits motor torque to a ring gear of the engine from a moving body, such as a pinion, so as to start up the engine.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Gear Transmission (AREA)
  • Valve Device For Special Equipments (AREA)
  • Gears, Cams (AREA)
US14/378,713 2012-05-17 2012-05-17 Engine startup device Active 2033-01-25 US9670892B2 (en)

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PCT/JP2012/062626 WO2013171876A1 (ja) 2012-05-17 2012-05-17 エンジン始動装置

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JP (1) JP5710071B2 (zh)
CN (1) CN104246208B (zh)
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JP2016205265A (ja) * 2015-04-24 2016-12-08 三菱電機株式会社 トルク伝達装置及びその製造方法

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WO2013171876A1 (ja) 2013-11-21
DE112012006378T5 (de) 2015-01-29
JP5710071B2 (ja) 2015-04-30
JPWO2013171876A1 (ja) 2016-01-07
US20150020761A1 (en) 2015-01-22
DE112012006378B4 (de) 2016-12-22
CN104246208B (zh) 2016-08-31

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